As Damien had said, it was not difficult for Adam to find a place where he could obtain the Twilight Crystal. It was not an easy task, but Silvana had already prepared several options for him.
After they moved to the K4 Level, she had more access to various information. She was used to this process, it happened every time Adam became stronger or learned new secrets from the Citadel.
The Gamma Division knew where the Twilight Crystals were located because it wasn't really a big secret. The monsters that controlled the territories didn't absorb the Twilight Crystal immediately after its appearance.
They waited until the Twilight Crystal accumulated a little more energy, covering the ground with its power.
Sure, this carried some risks, as other monsters or Phantoms could come and try to capture the Twilight Crystal, but the risk was justified and worth the reward.
